Light Yagami's actions in the anime "Death Note" have a significant impact on his own sense of morality and justice. Initially, Light believes that he is justified in using the Death Note to rid the world of criminals and create a utopia. However, as he continues to use the Death Note and becomes more consumed by power, his sense of morality becomes increasingly warped. He starts justifying more extreme actions and losing sight of his original intentions, ultimately leading to a downward spiral where he becomes the very thing he sought to eradicate. This transformation highlights the dangers of unchecked power and the corrupting influence it can have on one's sense of morality and justice.